AMSTERDAM (Reuters) - Dutch police said on Wednesday they were investigating whether the man believed responsible for last week’s deadly Christmas market attack in Berlin may have traveled through the Netherlands.

Handout pictures released on December 21, 2016 and acquired from the web site of the German Bundeskriminalamt (BKA) Federal Crime Office show suspect Anis Amri searched in relation with the Monday's truck attack on a Christmas market in Berlin. REUTERS/BKA/Handout via Reuters

Twelve people died in the Dec. 19 attack. The Tunisian suspect, 24-year-old Anis Amri, was shot dead Dec. 23 by Italian police.

Wim de Bruin, spokesman for the National Prosecutor’s Office, said there were “signs” 24-year-old Amri had passed though the Netherlands on his way to France, and an investigation was ongoing.